I enjoyed the series and I'm very glad we at least got an omake to try and tie the romantic plotline up somewhat, since she was the only one whose romantic feelings we didn't know yet.
Having said that, I'm not a fan of sudden, last chapter, disappearances in modern-day stories. It always feels beyond forced. Why couldn't they communicate for that whole year?
She said she couldn't accept calls because she would end up drawing manga again, which by itself would be a weird reason to ghost someone who means that much to you. But then we find out within the same conversation that she was drawing and selling manga anyway; so again why the ghosting? It feels mechanical.
I'm also not a fan of stories (especially yuri) tying up every plot and thematic point while coincidentally leaving the romantic plot point as an "obviously they'll get together in the future," wink-wink, or a "buy the physical volume so you'll get the kiss," wink-wink.
She just talked about wanting her body and warmth all for herself 2 chapters ago. So it definitely intended to represent their budding romance. If we're tying all the plot elements up why not tie all the plot elements up during the main story? Still enjoyed the series and the ending but those two things soured it every so slightly.